102238991 has 2 divisors, whose sum is σ = 102238992. Its totient is φ = 102238990.

The previous prime is 102238973. The next prime is 102239009. The reversal of 102238991 is 199832201.

It is a balanced prime because it is at equal distance from previous prime (102238973) and next prime (102239009).

It is a cyclic number.

It is not a de Polignac number, because 102238991 - 2²⁶ = 35130127 is a prime.

It is a super-2 number, since 2×102238991² = 20905622561396162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102238931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51119495 + 51119496.

It is an arithmetic number, because the mean of its divisors is an integer number (51119496).

Almost surely, 2^102238991 is an apocalyptic number.

102238991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102238991 is an equidigital number, since it uses as much as digits as its factorization.

102238991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 102238991 is about 10111.3298334096. The cubic root of 102238991 is about 467.5975047084.

The spelling of 102238991 in words is "one hundred two million, two hundred thirty-eight thousand, nine hundred ninety-one".